tut8 - (Phase Shift Keying signal is shown in the following...

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EE4212 Information and Coding Tutorial 8 1. Code Interleaving For each of the following conditions, design a block interleaver for a communication system operating over a bursty noise channel at a transmission rate of 19,200 coded symbols/s. (a) A contiguous noise burst typically lasts for 250 ms. The system code consists of a (127,36) BCH code with d min = 31. (b) A contiguous noise burst typically lasts for 20 ms. The system code consists of a rate 1/2 convolutional code with a feedback decoding algorithm that corrects an average of 3 symbols in a sequence of 21 symbols. 2. Trellis-Coded Modulation A Trellis-Coded Modulation (TCM) system for generating a trellis-coded 8-PSK
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Unformatted text preview: (Phase Shift Keying) signal is shown in the following figure. (a) Draw the trellis diagram of the convolutional encoder used in the TCM system. (b) Follow Ungerboeck’s rules, determine the binary assignment of the 8-PSK signal points based on mapping by set partitioning method. (c) Find the coding gain when this TCM scheme is used. (d) Suppose that a codeword sequence r = {0 1 0, 1 0 1, 1 0 0, 0 1 1} is received and the decoder starts with state 0 0, use Viterbi algorithm to find the maximum likelihood path through the trellis diagram. (Show the survival paths after each elimination. If a tie occurs between two entering paths, keep the upper one.)...
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  • Spring '11
  • wadewe
  • Error detection and correction, Trellis Diagram, contiguous noise burst, bursty noise channel, Trellis-Coded Modulation

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